中文摘要：

作为调感式消弧线圈中的一种，三相五柱式消弧线圈利用可控硅实现无级调节。但其调谐原理多采用极值法，极值法在谐振点附近零序电压变化不大，极值点的寻找精度不高，电容电流的测量容易与实际值出现偏差。文章为了解决极大值点难以寻找的问题，提出了一种新的调谐方法。根据测量的零序电压相位关系和系统阻尼率不变的特点，根据调谐构造出系统的导纳关系图，利用导纳角差计算系统的电容电流，使用MATLB仿真计算和实验平台实验测量，表明该方法比极值法计算的精度更高。

英文摘要：

Three-phase five-column arc suppression coil, as a tune arc-suppression coil, utilizes SCR toadjust induct-ance steplessly.Extreme tuning principle is usually used, but zero sequence voltage changes littlein the vicinity of the resonance point.It is not easy to search extreme point accurately, so large deviation occurs between the measurement of capacitance current and the actual value.A new method for tuning is proposed in this paper in order to solve the problem.According to zero sequence voltage phase relations measured and the characteristics of unchanged damping rate in the system, andthe admittance diagram is constructed by tuning and capacitance current can be computed through admittance angle.MATLB simulation and experiment platform measurements show that precision of this meth-od is higher than extreme value method.